In Los Angeles County, California (CA). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.

How big is Rio Hondo?

2 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.

EIA-860M names Metropolitan Water District of S CA as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.

Is this the same as Rio Hondo LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Metropolitan Water District of S CA here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Rio Hondo LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Rio Hondo still running?

EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.

Rio Hondo

Rio Hondo is a 2 MW hydroelectric power plant in Los Angeles County, California, operated by Metropolitan Water District of S CA. EIA-860M lists 1 generating unit here, inside CAISO. Its unit entered service in 1984.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Nameplate capacity: 1.9 MW; 1.9 MW net summer
Generating units: 1
In service: 1984
EIA plant ID: 482

Where it is

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County: Los Angeles County, California
Coordinates: 34.0047, -118.0992
Balancing authority: CISO
Sector: Electric Utility

Units, technology and status

Operator of record: Metropolitan Water District of S CA
Primary energy source: Hydro
Technologies: Conventional Hydroelectric
Status: Operating

Every plant Metropolitan Water District of S CA reports to EIA →

Rio Hondo: FAQ

Where is Rio Hondo?: In Los Angeles County, California (CA). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
How big is Rio Hondo?: 2 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
Who owns Rio Hondo?: EIA-860M names Metropolitan Water District of S CA as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
Is this the same as Rio Hondo LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Metropolitan Water District of S CA here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Rio Hondo LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Rio Hondo still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.